(photos coming in a week or so - gotta charge the camera).
Arms on my morris chair have through-mortises
It’s no small task -----
a) Determine overhang
b) Draw line down the length of arm, designating inside of of tenon
c) Draw line down length of arm, designating outside of tenon (width of tenon)
d) Determine forward projection of arm
e) Aligning arm with inside/outside lines – mark front of tenon
f) Mark back of tenon
g) Using resulting square – drill using forstner. Drill from the top of the arm to the bottom to prevent visible tear-out.
h) Chisel down into the straight marked lines slightly to avoid tear-out
i) Clean out the mortise with a jigsaw (be sure blade runs very straight --- always cut slightly inside the line)
j) Straighten out mortise using chisels.
k) Check for fit over tenon
l) Fine tune with chisel --- sneak up on it.
Biggest problem I have is tear-out. However, if the tear-out is on the bottom of the chair arm,, I can deal. I'm also preventing tear-out by chiseling into the mortise lines a little.
I think a mortiser might work a little better - but I don't have one. The through mortise is 1 3/8" square. A 1" chisel works fairly well ---- as long as you pre-chisel a little.
Arms on my morris chair have through-mortises
It’s no small task -----
a) Determine overhang
b) Draw line down the length of arm, designating inside of of tenon
c) Draw line down length of arm, designating outside of tenon (width of tenon)
d) Determine forward projection of arm
e) Aligning arm with inside/outside lines – mark front of tenon
f) Mark back of tenon
g) Using resulting square – drill using forstner. Drill from the top of the arm to the bottom to prevent visible tear-out.
h) Chisel down into the straight marked lines slightly to avoid tear-out
i) Clean out the mortise with a jigsaw (be sure blade runs very straight --- always cut slightly inside the line)
j) Straighten out mortise using chisels.
k) Check for fit over tenon
l) Fine tune with chisel --- sneak up on it.
Biggest problem I have is tear-out. However, if the tear-out is on the bottom of the chair arm,, I can deal. I'm also preventing tear-out by chiseling into the mortise lines a little.
I think a mortiser might work a little better - but I don't have one. The through mortise is 1 3/8" square. A 1" chisel works fairly well ---- as long as you pre-chisel a little.
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